Meiko UPster U 400 M2 Error Code ERR 001: EEPROM Error
ERR 001 on a Meiko UPster U 400 M2 means an EEPROM error, a problem reading or writing the chip that holds the machine's settings. Switch the machine off with its own key, wait a minute and switch it on again. If ERR 001 returns, leave it off and call us.
High: the control cannot trust its settings, so the machine should not run until it is fixed.
- Code
- ERR 001
- Maker
- MEIKO
- Equipment
- Dish machines
- Applies to
- UPster U 400 M2
What does MEIKO error code ERR 001 mean?
Every modern dishwasher control keeps its settings in a small memory chip called an EEPROM. These are the values that tell the UPster U 400 M2 how to run each program: temperatures, times, dosing and more. At power-up and during operation the control reads that memory, and it writes to it when something is changed. ERR 001 appears when that read or write fails, and the manual calls it an EEPROM error. Without reliable settings the machine cannot be trusted to run its programs correctly, so the control stops and asks for a technician. The causes behind it vary. A power dip or surge can corrupt stored values, settings can be lost and need to be loaded again, or the memory chip on the control board can fail outright. A single restart sometimes clears the message if the cause was a momentary glitch. If it comes back, running the machine on corrupt settings risks poor washing or bad dosing, which is why the advice is to leave it off.
Affected models and control systems
This is for the Meiko UPster U 400 M2 glass and dishwasher. Other Meiko models and other controller generations use different error numbers.
Code numbers and their meaning can change between control generations. We match the full model and control before acting on a code.
What you may notice
- ERR 001 on the display at power-up or during a cycle
- Machine that will not start a program
- Settings or program values that seem to have reset
Possible causes
Listed in MEIKO's documentation
- Settings memory on the control board that cannot be read or written
- A power dip or surge that corrupted the stored settings
- Machine settings that were lost and must be loaded again
- A control board whose memory chip has failed
Other likely causes — what usually sits behind error code ERR 001 on this control. A technician confirms which one it is before any part is replaced.
- A storm or building power event just before the error
- Control board that was replaced and not loaded with the right settings
Safe checks before calling for service
- Write down ERR 001 and what the machine was doing.
- Switch the machine off with its own key, wait a minute, and switch it on again.
- If ERR 001 returns, leave the machine off.
- Call us. We read the machine with the service tool and give you a written price first.
How a technician diagnoses error code ERR 001
- Read the error and any stored history.
- Check supply voltage and recent power events.
- Read the stored settings with the service tool.
- Reload the machine settings and test.
- Check the board for damage or a failing memory chip.
- Replace the control board only after the reload fails.
- Reading and reloading settings needs the maker's service tool and the data for this exact model.
- The control board sits inside the cabinet beside live 208-240 V wiring.
- Wrong settings can cause bad dosing, wrong temperatures or an unsafe cycle.
How error code ERR 001 differs from similar codes
ERR 001 is a memory problem on the control board, unlike the door, water and drain codes that follow it.
Technical reference
- Document
- UPster U 400 M2 Original operating instructions 9760441 (update 2026-06), 9.6.1 Messages p.33-35
- Edition
- 9760441 / Valid from: 2018-02 / Update: 2026-06
- Models / control
- UPster U 400 M2
- Section
- 9.6.1 Messages: INFO table printed p. 33, ERR table pp. 34-35 (of 50)
- Checked
- October 2026
We use the maker's document to read the code and do not reproduce it. Always confirm the complete model and control before applying these steps.
Related MEIKO dish machine error codes
Can I keep using the machine after a restart clears ERR 001?
For the moment, yes, but note it. If it returns, stop and call.
Will I lose my programs?
The settings may need to be loaded again. A technician does that with the service tool.
Is ERR 001 a power problem?
It can be triggered by a dip or surge, but the memory chip itself may also have failed.
Need help with MEIKO error code ERR 001?
A technician confirms the cause on site and gives you the price in writing before any work starts.